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3 years ago

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Which of these is NOT a vector quantity?

1 answer:

Vlada [557]3 years ago

3 0

The answer to that question is c. acceleration due to gravity

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A motorcycle that is slowing down uniformly. The motorcycle covers 1 ????m=1000 m in 80 sec⁡. The motorcycle then covers the nex

Lynna [10]

Answer:

Part a)

acceleration = -0.042 m/s/s

Part b)

initial speed = 14.17 m/s

final speed = 5.77 m/s

Explanation:

Part a)

Let the initial velocity of the motorcycle is

$v_i = v_o$

now at the end of 80 s let the speed is

$v_f = v_1$

after another 120 s let the speed will be

$v_f' = v_2$

now we know that

$d = \frac{v_i + v_f}{2} (t)$

$d = \frac{v_o + v_1}{2}(80)$

$1000 = 40(v_o + v_1)$

also we know that

$v_1 - v_o = a(80)$

also we have

$1000 = \frac{v_1 + v_2}{2}(120)$

$1000 = 60(v_1 + v_2)$

now we can say

$(v_2 + v_1) - (v_o + v_1) = \frac{50}{3} - \frac{50}{2}$

also we know

$v_2 - v_o = a(120 + 80)$

$-8.33 = 200 a$

$a = -0.042 m/s^2$

Part b)

now we have

$v_1 + v_o = 25$

$v_1 - v_o = (-0.042)(80)$

$v_1 = 10.83 m/s$

so the starting velocity of the trip is

$v_o = 25 - 10.83 = 14.17 m/s$

now speed after t = 200 s is given as

$v_2 = v_o + at$

$v_2 = 14.17 - (0.042)(200)$

$v_2 = 5.77 m/s$

5 0

3 years ago

The stoplight had just changed and a 2100 kg Cadillac had entered the intersection, heading north at 3.2 m/s , when it was struc

elena55 [62]

Explanation:

It is given that,

Mass of the Cadillac, $m_1=2100\ kg$

Speed of Cadillac, $v_1=3.2\ m/s$ (towards north)

Mass of Volkswagen, $m_2=1100\ kg$

The cars stuck together and slid to a halt, leaving skid marks angled 35 degrees north of east.

According to the law of conservation of momentum,

The momentum along x axis, $m_1v_1=(m_1+m_2)\ usin35$ ............(1)

The momentum along y axis, $m_2v_2=(m_1+m_2)\ ucos35$ ...........(2)

From equation (1) and (2) it is clear that,

$\dfrac{m_1v_1}{m_2v_2}=tan35$

$v_2=\dfrac{m_1v_1}{m_2\ tan35}$

$v_2=\dfrac{2100\times 3.2}{1100\times \ tan35}$

$v_2=8.72\ m/s$

So, the Volkswagen going just before the impact is 8.72 m/s. Hence, this is the required solution.

6 0

3 years ago

Help me pleas.pleas help me<br> Science

Alexus [3.1K]

Answer: A. Radiation can move through empty space to transfer heat; conduction cannot.

Now unlike convection and conduction, radiation does not require matter to transfer heat. It also does not require a medium to transfer heat, crossing off the other options regardless.

I hope this helps!

6 0

3 years ago

Please helppp!!! , i can't afford to fail in this course again

Mrrafil [7]

Answer:

the swing on the right is more likely to break

since the vertical component of the tension of the rope has to balance the weight. ie. the resultant tension in the rope is greater

6 0

4 years ago

1–Find the components of each vector

navik [9.2K]

Answer:

ANSWERS ARE 100 % correct

Explanation:

trust me

7 0

3 years ago